Improvement in friction gear-wheels



A. J. DAVIS. Friction Gear-Wheel.

Patented Sept. 23, 1879.

fn w if, Za /1 UNITED STATES PATENT OEETCE.

ALBERT J. DAVIS, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN FRICTION GEAR-WHEELS.

Specification forming part of Letters Patent No. 219,922, dated September 23, 1879,' application led August l5, 1879.

To all whom it may concern:

Be it known that I, ALBERT J. DAvs, of Newark, in the county of Essex, State of New Jersey, have invented a new and useful Improvement in Friction Gear-Wheels,of which the following is a specitieation.

My invention relates toan improvement in friction gear-wheels 5' .and 4consists in utilizing the web of a driving-gear to cont-ain wooden fri ctional blocks, secured therein by dovetailed ribs, and formed. with an interior conical surfaceto operate with a cast-iron cone.

I am aware that wood has been combined .with gear-wheels before to transmit the power or motion of the gear by friction upon the Wooden surface; but in.V all such cases the wheel has been provided" with some other flange than the web'of the gear, thus increasing the width of the gear an amount equal to the width ofthe iiangeor wooden cone, while by the construction I adopt the entirewidth of the gear is utilized to contain the wood excepting the part occupiedrby the plate or arms at 011e side of the gear. .That this is a matter of considerable value will be apparent from a description of thedrawin gs attached hereto, of which- Figure 1is a side or flat view of a frictiongear having its web lined for apart of its circumierencewith wooden blocks, the remainder of the blocks being removed to show the arrangement of the ribs for driving the blocks. Fig. 2 is a longitudinal' section of the frictiongear mounted upon aV shaft, A, with a hoistin g-drum, B, one end of the latter being formed with a cone of iron to operate in contact with the interior of the wooden blocks.

The bearings or pillow-blocks of the shaft would be placed at C and D, outside the drum and gear, and the drum and gear be pressed together when in action in the usual way.

lhe blocks t are curved externally to fit thel plate e, which connects the web b with the hubf, and ribs t may also be formed on the plate adjoining the ends of the ribs, to support the inner ends of the blocks against the strain applied by the drum.

The ribs t' being useful chiefly to strengthen the blocks at when made of ygreat depth, they may be omitted without affecting the value of my invention.

If desired, screws may be inserted through the plate e or web b into the wooden blocks;

butin practice I iind thedovetailed ribs d suffice to keep the blocks in place.

By the construction I have described the friction-wheel and drum take less room upon the shaft A than by any other arrangement, as the coneprojecting from the druniis received into the interior of the gear-wheehthe whole f width of which is utilized for the frictionblocks except the thickness of the plate e.

In cases where it is desired touse frictionblocks, or a conical surface greater than the width of the gear-wheel, the web b may be eX- tended toward the drum B beyond the inner ends of the teeth c. Y

The compactness of this construction makes a much greater saving than would be imagined in the construction of hoisting-machines and similar apparatus in which such friction-gears are used, as any increase in the length of the shaft A necessitates a longer pinion-shaft to drive the gear, and a greater Width to the entire framie .g of the machine connected with the gear. ,p

The location of the blocks inside the driving-gear web b also affords the greatest possible security against derangement or injury to the same, and the arrangement of the blocks within a rough shell, like the web b, permits the device to be constructed at the lowest possible cost.

I am aware that dovetailed ribs have been used to hold wooden blocks or frictional apparatus in a recessed wheel, as in Patentv No. 179,869, issued to B. Sanford, July 18, 1876; but I do not claim the use of such ribs except asherein stated,-and therefore claim the same in combination with the gear-Wheel and blocks a, in the manner following.

I claim as my invention- In testimony that I claim the foregoing I In a friction gear or oog wheel, tho coluhihave hereunto set my hand in the presence ot 11a-tion of the web I), provided upon they outtwo Witnesses.

side with the teeth c. and the blocks a, titted ALBERT J. DAVIS. upon the inside ofthe web, and supported by Witnesses: the dovetailed ribs d, substantially as and for GEO. H. BODENSCHATZ,

the purpose herein set forth. WM. I.. FISH. 

